Variable-positioning based reporting method in wireless communication system and device supporting same

ABSTRACT

Provided is a reporting method performed by a terminal in a wireless communication system. The method comprises receiving positioning duration setting from a network, evaluating a positioning enabling condition, and if the positioning enabling condition is satisfied, starting a positioning duration timer, enabling positioning, acquiring position information through the enabled positioning, and transmitting a report message including a measurement result and the position information to the network.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the National Stage filing under 35 U.S.C. 371 ofInternational Application No. PCT/KR2013/004218, filed on May 13, 2013,which claims the benefit of U.S. Provisional Application Ser. No.61/646,275, filed on May 12, 2012, and 61/650,449, filed on May 22,2012, the contents of which are all hereby incorporated by referenceherein in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to wireless communications and, moreparticularly, to a reporting method based on variable positioningperformed by a user equipment and an apparatus for supporting the same.

2. Related Art

The 3rd Generation Partnership Project (3GPP) long term evolution (LTE)which is an improvement of Universal Mobile Telecommunications System(UMTS) is introduced as 3GPP release 8. The 3GPP LTE uses orthogonalfrequency division multiple access (OFDMA) in downlink and uses SingleCarrier-frequency division multiple access (SC-FDMA) in uplink. Andmultiple input multiple output (MIMO) having maximum 4 antennas isadopted. Recently, the 3GPP LTE-Advanced (LTE-A) which is an evolutionof the 3GPP LTE has been discussed.

In order to optimize the performance of network, the network acquiresthe measurement result from a user equipment. In this time, the networkacquires the relevant location information together with the measurementresult and enables to optimize the network performance more effectively.For the optimization of the network, operators may acquire themeasurement result and the location information using the userequipment, and it is called Minimization of Driving Test (MDT).

The network may ask the user equipment to activate the function ofpositioning. The user equipment may activate the positioning in order toacquire the location information related to the measurement result, andreport the acquired location information with the measurement result tothe network.

Since the function of positioning performed by the user equipment maycause lots of power consumption of the user equipment, it may bepreferable to be configured that the positioning is performed only for aspecific interval and only if necessary. The present invention suggestsa method for acquiring the location information for the positioninginterval configured for the user equipment and reporting the acquiredlocation information with the measurement result.

SUMMARY OF THE INVENTION

The technical object of the present invention is to provide a reportingmethod based on variable positioning in wireless communication systemand an apparatus for supporting the same.

In an aspect of the present invention, a reporting method performed by auser equipment in a wireless communication system is provided. Themethod includes receiving a positioning duration time configuration fora network, evaluating a positioning activation condition, initiating apositioning duration timer if the positioning activation condition issatisfied, activating the positioning, acquiring location informationthrough the activated positioning, and transmitting a report messagethat includes a measurement result and the location information.

The positioning duration timer may be configured as a time intervalindicated by the positioning duration configuration.

The method may further include deactivating the activated positioning ifthe positioning duration timer configured is terminated.

The method may further include receiving a logged measurement to performa logged Minimization Driving Test (MDT).

The step of evaluating the positioning activation condition may includedetermining that the positioning activation condition is satisfied ifthe user equipment enters RRC_IDLE state.

The method may further include receiving a measurement configuration forthe measurement and report. The measurement configuration may includeinformation that instructs to report with the location information whenreporting the measurement result.

The method may further include acquiring the measurement result byperforming the measurement. The step of evaluating the positioningactivation condition may include determining that the positioningactivation condition is satisfied if the report condition for themeasurement result acquired by the measurement is satisfied.

The step of evaluating the positioning activation condition may includedetermining that the positioning activation condition is satisfied ifRadio Link Failure (RLF) is detected.

In another aspect of the present invention, a wireless apparatus whichis performing in a wireless communication system is provided. Thewireless apparatus includes a radio frequency (RF) unit that transmitsand receives a radio signal, and a processor operating functionallyconnected with the RF unit. The process is configured to performreceiving a positioning duration time configuration for a network,evaluating a positioning activation condition, initiating a positioningduration timer if the positioning activation condition is satisfied,activating the positioning, acquiring location information through theactivated positioning, and transmitting a report message that includes ameasurement result and the location information.

The reporting method based on variable positioning according to theembodiments of the present invention enables a user equipment toactivate the positioning for a specific interval and to acquire thelocation information by setting a positioning activation duration timefor the user equipment by network. Consequently, the network is able toacquire the valid location information more accurately for at least thecorresponding activation interval, and therefore, the networkperformance can be more optimized. In addition, the user equipment doesnot always activate the positioning in order to acquire the locationinformation and deactivates it except for the positioning activationduration time, thereby unnecessary power consumption can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication system to which the presentinvention is applied.

FIG. 2 is a block diagram illustrating a radio protocol architecture fora user plane.

FIG. 3 is a block diagram illustrating a radio protocol architecture fora control plane.

FIG. 4 is a flowchart illustrating an operation of a UE in an RRC idlestate.

FIG. 5 is a flowchart illustrating a procedure of establishing an RRCconnection.

FIG. 6 is a flowchart illustrating a procedure of reconfiguring the RRCconnection.

FIG. 7 is a drawing illustrating the procedure of the RRC connectionre-establishment.

FIG. 8 is a flowchart illustrating a method of performing a logged MDT.

FIG. 9 is a drawing illustrating an example of the logged MDT accordingto the logging area.

FIG. 10 is a drawing illustrating an example of the logged MDT accordingto the change of the RAT.

FIG. 11 is a diagram showing an example of the logged measurement.

FIG. 12 is a diagram showing an example of an immediate MDT.

FIG. 13 is a drawing illustrating an example of the wirelesscommunication system structure to which the positioning of the UEaccording to an embodiment of the present invention is applied.

FIG. 14 is a drawing illustrating all procedures for the locationservice according to an embodiment of the present invention.

FIG. 15 is a drawing illustrating a reporting method based on variablepositioning according to an embodiment of the present invention.

FIG. 16 is a drawing illustrating an example of reporting method basedon variable positioning according to an embodiment of the presentinvention.

FIG. 17 is a drawing illustrating another example of reporting methodbased on variable positioning according to an embodiment of the presentinvention.

FIG. 18 is a drawing illustrating still another example of reportingmethod based on variable positioning according to an embodiment of thepresent invention.

FIG. 19 is a block diagram illustrating the wireless apparatus in whichan embodiment of the present invention can be implemented.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

FIG. 1 illustrates a wireless communication system to which the presentinvention is applied. This may also be called an evolved-UMTSterrestrial radio access network (E-UTRAN) or a long term evolution(LTE)/LTE-A system.

The E-UTRAN includes a base station (BS) 20 that provides a controlplane and a user plane to a user equipment (UE) 10. The UE 10 may befixed or movable and may be called other terms such as a mobile station(MS), a user terminal (UT), a subscriber station (SS), a mobile terminal(MT), a wireless device, and the like. The base station 20 represents afixed station that communicates with the UE 10, and may be called otherterms such as an evolved-NodeB (eNB), a base transceiver system (BTS),an access point, and the like.

The base stations 20 may be connected to each other through an X2interface. The base station 20 is connected with an evolved packet core(EPC) 30 through an S1 interface, in more detail, a mobility managemententity (MME) through an S1 MME and a serving gateway (S-GW) through anS1-U.

The EPC 30 is constituted the MME, the S-GW, and a packet data networkgateway (P-GW). The MME has access information of the UE or informationon a capability of the UE, and the information is primarily used formobility management of the UE. The S-GW is a gateway having the E-UTRANas an end point and the P-GW is a gateway having a PDN as the end point.

Layers of a radio interface protocol between the UE and a network may bedivided into an L1 (first layer), an L2 (second layer), and an L3 (thirdlayer) based three lower layers of an open system interconnection (OSI)reference model which is widely known in a communication system andamong them, a physical layer that belongs to the first layer provides aninformation transfer service using a physical channel and a radioresource control (RRC) layer positioned on the third layer serves tocontrol radio resources between the UE and the network. For this, theRRC layer exchanges an RRC message between the UE and the base station.

FIG. 2 is a block diagram illustrating a radio protocol architecture fora user plane. FIG. 3 is a block diagram illustrating a radio protocolarchitecture for a control plane. A data plane is a protocol stack foruser data transmission and the control plane is a protocol stack fortransmitting a control signal.

Referring to FIGS. 2 and 3, a physical (PHY) layer provides theinformation transfer service to an upper layer by using the physicalchannel. The physical layer is connected with a medium access control(MAC) layer as an upper layer through a transport channel. Data movebetween the MAC layer and the physical layer through the transportchannel. The transport channel is classified depending on a transmissionmethod and a transmission feature through a radio interface.

Data move between different physical layers, that is, between physicallayers of a transmitter and a receiver through the physical channel. Thephysical channel may be modulated by orthogonal frequency divisionmultiplexing (OFDM) and uses a time and a frequency as the radioresource.

A function of the MAC layer includes mapping between a logic channel andthe transport channel, and multiplexing/demultiplexing to a transportblock provided to the physical channel onto the transport channel of anMAC service data unit (SDU) that belongs to the logic channel. The MAClayer provides a service to a radio link control (RLC) layer through thelogic channel.

A function of the RLC layer includes concatenation, segmentation, andreassembly of an RLC SDU. In order to assure various quality of services(QoS) requested by a radio bearer (RB), the RLC layer provides threeoperating modes of a transparent mode (TM), an unacknowledged mode (UM),and an acknowledged mode (AM). An AM RLC provides error correctionthrough an automatic repeat request (ARQ).

The radio resource control (RRC) layer is defined only on the controlplane. The RRC layer serves to control the logic channel, the transportchannel and the physical channels in association with configuration,re-configuration, and release of radio bearers. The RB means a logicroute provided by the first layer (PHY layer) and the second layers (theMAC layer, the RLC layer, and the PDCP layer) in order to transfer databetween the UE and the network.

A function of a packet data convergence protocol (PDCP) layer on theuser plane includes transferring of user data, header compression, andciphering. A function of a packet data convergence protocol (PDCP) layeron the user plane includes transferring of control plane data andciphering/integrity protection.

Setting the RB defines features of the radio protocol layer and channelin order to provide a specific service and means a process of settingrespective detailed parameters and operating methods. The RB may bere-divided into two types of a signaling RB (SRB) and a data RB (DRB).The SRB is used as a passage for transmitting the RRC message on thecontrol plane and the DRB is used as a passage for transmitting the userdata on the user plane.

When an RRC connection is established between the RRC layer of the UEand the RRC layer of the E-UTRAN, the UE is in an RRC connected stateand if not, the UE is in an RRC idle state.

A downlink transport channel for transmitting data from the network tothe UE includes a broadcast channel (BCH) for transmitting systeminformation and besides, the downlink transport channel includes adownlink shared channel (SCH) for transmitting user traffic or a controlmessage. Traffic or a control message of a downlink multicast orbroadcast service may be transported through the downlink SCH ortransported through an additional downlink multicast channel (MCH).Meanwhile, an uplink transport channel for transporting data from the UEto the network includes a random access channel (RACH) for transportingan initial control message and besides, an uplink shared channel (SCH)for transporting the user traffic or control message.

The logical channel that is positioned on the transport channel andmapped to the transport channel includes a broadcast control channel(BCCH), a paging control channel (PCCH), a common control channel(CCCH), a multicast control channel (MCCH), a multicast traffic channel(MTCH), and the like.

The physical channel is constituted by a plurality of OFDM symbols in atime domain and a plurality of sub-carriers in a frequency domain. Onesub-frame is constituted by the plurality of OFDM symbols in the timedomain. A resource block as a resource allocation unit is constituted bythe plurality of OFDM symbols and the plurality of sub-carriers.Further, each sub-frame may use specific sub-carriers of specific OFDMsymbols (e.g., a first OFDM symbol) of a corresponding sub-frame for thephysical downlink control channel (PDCCH), that is, an L1/L2 controlchannel. A transmission time interval (TTI) is a unit time oftransmitting the sub-frame.

Hereinafter, the RRC state and the RRC connection method of the UE willbe described in detail.

The RRC state represents whether the RRC layer of the UE is logicallyconnected with the RRC layer of the E-UTRAN and a case in which both RRClayers are logically connected to each other is called the RRCconnection state and a case in which both RRC layers are not logicallyconnected to each other is called the RRC idle state. Since the RRCconnection exists in the UE in the RRC connection state, the E-UTRAN maydetermine the existence of the corresponding UE by the unit of a cell tothereby effectively control the UE. On the contrary, the E-UTRAN may notdetermine the UE in the RRC idle state and a core network (CN) ismanaged by the unit of a tracking area which a region unit larger thanthe cell. That is, it is determined whether the UE in the RRC idle stateexists by the unit of a large region, and the UE needs to move to theRRC connection state in order to receive a general mobile communicationservice such as voice or data.

When a user first turns on a power supply of the UE, the UE firstretrieves an appropriate and thereafter, the UE stays in the RRC idlestate in the corresponding cell. The UE in the RRC idle stateestablishes the RRC connection with the E-UTRAN through an RRCconnection procedure at least when the UE in the RRC idle state needs tomake the RRC connection, and is transited to the RRC connections state.Cases in which the UE in the RRC idle state needs to make the RRCconnection are various, and for example, uplink data transmission isrequired due to a user's call attempt or when a paging message isreceived from the E-UTRAN, the cases may include response messagetransmission thereto.

A non-access stratum layer (NAS) located above the RRC layer performsfunctions such as session management and mobility management.

In order to manage mobility of the UE on the NAS layer, two states ofEPS mobility management (EMM)-REGISTERED and EMM-DEREGISTERED aredefined and both states are applied to the UE and the MME. An initial UEis in the EMM-DEREGISTERED state and the UE performs a process ofregistering the initial UE in a corresponding network through an initialattach procedure in order to access the network. When the attachprocedure is successfully performed, the UE and the MME are in theEMM-REGISTERED state.

In order to manage a signaling connection between the UE and the EPC,two states of an EPS connection management (ECM)-IDLE state and anECM-CONNECTED state are defined and both states are applied to the UEand the MME. When the UE in the ECM-IDLE state makes the RRC connectionwith the E-UTRAN, the corresponding UE is in the ECM-CONNECTED state.When the MME in the ECM-IDLE state makes an S1 connection with theE-UTRAN, the MME is in the ECM-CONNECTED state. When the UE is in theECM-IDLE state, the E-UTRAN does not have context information of the UE.Therefore, the UE in the ECM-IDLE state performs a UE based mobilityassociated procedure such as cell selection or cell reselection withoutthe need for receiving a command of the network. On the contrary, whenthe UE is in the ECM-CONNECTED state, the mobility of the UE is managedby the command of the network. When the position of the UE in theECM-IDLE state is different from a position which the network knows, theUE notifies a corresponding position of the UE to the network through atracking area update procedure.

Next, the system information will be described.

The system information includes required information which the UE needsto know to access the base station. Therefore, the UE needs to receiveall of the system information before accessing the base station andfurther, the UE continuously needs to have latest system information. Inaddition, since the system information is information which all UEs inone cell need to know, the base station periodically transmits thesystem information.

According to Phrase 5.2.2 of 3GPP TS 36.331 V8.7.0 (2009-09) “RadioResource Control (RRC); Protocol specification (Release 8)”, the systeminformation is divided in to a master information block (MIB), ascheduling block (SB), and a system information block (SIB). The MIBallows the UE to know a physical component, for example, a bandwidth.The SB allows the UE to know transmission information of the SIBs, forexample, a transmission period, and the like. The SIB is an aggregate ofassociated system information. For example, any SIB includes onlyinformation on a neighboring cell and any SIB includes only informationon an uplink wireless channel used by the UE.

In general, a service which the network provides to the UE may bedivided into three types. Further, the UE differently recognizes even atype of the cell by considering which service the UE receives. Theservice type will be first described below and thereafter, the type ofthe cell will be described.

1) Limited service: The service may provide an emergency call and anearthquake and Tsunami warning system (ETWS), and provide the emergencycall and the earthquake and Tsunami warning system (ETWS) in anacceptable cell.

2) Normal service: The service may mean a public use general service andmay provide the public use general service in a suitable or normal cell.

3) Operator service: The service may mean a service for a communicationnetwork operator and only the communication network operator may use thecell and a general user may not use the cell.

The type of the cell may be divided as below in association with theservice type provided by the cell.

1) Acceptable cell: Cell where the UE may receive the limited service.The cell is a cell that is not barred in terms of the corresponding UEand satisfies a cell selection criterion of the UE.

2) Suitable cell: Cell where the UE may receive the suitable service.The cell satisfies a condition of the acceptable cell andsimultaneously, satisfies additional conditions. As the additionalconditions, the cell needs to belong to a public land mobile network(PLMN) which the corresponding UE may access and needs to be a cellwhere execution of the tracking area update procedure of the UE is notbarred. When the corresponding cell is the CSG cell, the correspondingcell needs to be a cell where the UE may access the cell as a CSGmember.

3) Barred cell: The cell is a cell where information indicating that thecorresponding cell is a cell barred through the system information isbroadcasted.

4) Reserved cell: The cell is a cell where information indicating thatthe corresponding cell is a cell reserved through the system informationis broadcasted.

FIG. 4 is a flowchart illustrating an operation of a UE in an RRC idlestate. FIG. 4 illustrates a procedure of registering a UE of whichinitial power is turned on in the network through a cell selectionprocess and thereafter, cell reselection is performed as necessary.

Referring to FIG. 4, the UE selects radio access technology (RAT) forcommunicating with the public land mobile network from which the UEitself intends to receive the service (step, S410). Information on thePLMN and the RAT may be selected by a user of the UE and the informationstored in a universal subscriber identity module (USIM) may be used.

The UE selects a cell having a largest value among cell having measuredlarger signal intensity or quality than specific values (cell selection)(step, S420). The UE of which power is turned on performs the cellselection and the execution of the cell selection may be called initialcell selection. A cell selection procedure will be described below indetail. After the cell selection, the UE receives the system informationwhich the base station periodically sends. The aforementioned specificvalue represents a value defined in the system in order to receive anassurance for quality of a physical signal in transmitting/receivingdata. Therefore, the value may vary depending on the applied RAT.

When network registration is required, the UE performs a networkregistration procedure (step, S430). The UE registers its owninformation (e.g., IMSI) in order to receive a service (e.g., paging)from the network. The UE does not register the information in theaccessed network whenever selecting the cell, and registers theinformation when information (e.g., a tracking area identity; TAI) ofthe network that receives from the system information is different frominformation on a network known by the UE.

The UE performs the cell reselection based on a service environmentprovided by the cell or an environment of the UE (step, S440). When avalue of measured intensity or quality of the signal from a base stationfrom which the UE receives the service is smaller than a value measuredfrom a base station of a neighboring cell, the UE selects one of othercells that provide a more excellent signal feature than the cell of thebase station accessed by the UE. This process is distinguished from theinitial cell selection as Process No. 2 to be cell re-selection. In thiscase, a temporal constraint is given in order to prevent the cell frombeing frequently reselected with the variation of the signal feature. Acell selection procedure will be described below in detail.

FIG. 5 is a flowchart illustrating a procedure of establishing an RRCconnection.

The UE sends to the network an RRC connection request message forrequesting the RRC connection (step, S510). The network sends an RRCconnection setup message as a response to the RRC connection request(step, S520). The UE enters an RRC connection mode after receiving theRRC connection setup message.

The UE sends to the network an RRC connection setup complete messageused to verify successful completion of establishing the RRC connection(step, S530).

FIG. 6 is a flowchart illustrating a procedure of reconfiguring the RRCconnection. The RRC connection reconfiguration is used to modify the RRCconnection. The RRC connection reconfiguration is used for perform RBestablishment/modification/release, handover, and measurementsetup/modification/release.

The network sends to the UE an RRC connection setup message formodifying the RRC connection (step, S610). The UE sends to the networkan RRC connection reconfiguration complete message used to verifysuccessful completion of establishing the RRC connection reconfigurationas a response to the RRC connection reconfiguration (step, S620).

Hereinafter, the public land mobile network (PLMN) will be described.

The PLMN is a network that is deployed and operated by mobile networkoperators. Each mobile network operator operates one or more PLMN. EachPLMN may be distinguished by Mobile Country Code (MCC) and MobileNetwork Code (MNC). The PLMN information of cells is included in thesystem information and broadcasted.

For selecting PLMN, cells and reselecting cells, various types of PLMNsmay be considered by a UE.

HPLMN (Home PLMN): The PLMN having MCC and MNC which are respectivelymatched to MCC and MNC of a UE IMSI.

EHPLMN (Equivalent HPLMN): The PLMN handled to be equivalent to theHPLMN.

RPLMN (Registered PLMN): The PLMN of which the location is successfullyregistered.

EPLMN (Equivalent PLMN): The PLMN handled to be equivalent to the RPLMN.

Each consumer of the mobile service subscribes to the HPLMN. When thegeneral service is provided for a UE through the HPLMN or the EHPLMN,the UE is not in the roaming state. On the other hand, a service isprovided for a UE through the PLMN except the HPLMN/EHPLMN, the UE is inthe roaming state, and the PLMN is called Visited PLMN (VPLMN).

When the power of the UE is turned on at an initial stage, the UEretrieves the public land mobile network (PLMN) and selects anappropriate PLMN capable of receiving the service. The PLMN is a networkthat is deployed or operated by a mobile network operator. Each mobilenetwork operator operates one or more PLMNs. Each of the PLMNs may beidentified by a mobile country code (MCC) and a mobile network code(MNC). The PLMN information of the cell is included in the systeminformation and broadcasted. The UE attempts to register the selectedPLMN. When the registration is succeeded, the selected PLMN becomes aregistered PLMN (RPLMN). The network may signal a PLMN list to the UEand the PLMNs included in the PLMN list may be considered as the PLMNsuch as the RPLMN. The UE registered in the network needs to bereachable by the network. When the UE is in the ECM-CONNECTED state(similarly, the RRC connection state), the network recognizes that theUE receives the service. However, when the UE is in the ECM-IDLE state(similarly, the RRC idle state), a situation of the UE is not effectivein the eNB, but the situation is stored in the MME. In this case, theposition of the UE which is in the ECM-IDLE state is known to only theMME as granularity of a list of tracking areas (TAs). A single TA isidentified by a tracking area identity configured by the PLMN identityto which the TA belongs and the tracking area code (TAC) uniquelyexpressing the TA in the PLMN.

Subsequently, the UE selects a cell having signal quality and feature toreceive an appropriate service among cells provided by the selectedPLMN.

Next, the procedure of a UE selecting a cell will be described indetail.

When power is turned on or being remained in a cell, the UE performs theprocedures to be serviced by selecting/reselecting a cell of adequatequality.

The UE in the RRC idle state should select the cell of adequate qualityalways and be ready for being serviced through the cell. For example,the UE which is just turned on should select a cell of adequate qualityin order to register a network. When the UE in the RRC connection stateenters the RRC idle state, the UE should select the cell which is goingto remain in the RRC idle state. As such, the procedure of selecting acell satisfying a certain condition in order for the UE to remain in theservice standby state such as the RRC idle state is called the CellSelection. It is an important point to select the cell as quick aspossible, since the cell selection is performed in the state that thecell where the UE remains in the RRC idle state is not yet determined.Accordingly, if the cell provides a high level of wireless signalquality, the cell can be selected in the procedure of cell selectionalthough the cell is not a cell that provides the best wireless signalquality.

Now, with reference to 3GPP TS 36.304 V8.5.0 (2009-03) “User Equipment(UE) procedures in idle mode (Release 8)”, the method and procedure thata UE select a cell in 3GPP LTE will be described.

The cell selection process is generally divided into two ways.

First, as an initial cell selection process, the UE has no advanceinformation on the radio channel during this process. Therefore, the UEretrieves all radio channels in order to find the appropriate cell. TheUE finds the strongest cell in each channel. Thereafter, the UE selectsthe corresponding cell only at the time of finding the suitable cellthat satisfies the cell selection criterion.

Next, the UE may select the cell by using stored information or usinginformation broadcasted in the cell. Therefore, the cell selection maybe rapidly performed as compared with the initial cell selectionprocess. When the UE only finds the cell that satisfies the cellselection criterion, the UE selects the corresponding cell. When the UEdoes not find the suitable cell that satisfies the cell selectioncriterion through such a process, the UE performs the initial cellselection process.

After the UE selects a predetermined cell through the cell selectionprocess, the strength or quality of the signal between the UE and thebase station may be changed due to the mobility of the UE or a change ofa wireless environment. Therefore, when the quality of the selected celldeteriorates, the UE may select other cell that provides higher quality.When the cell is again selected as such, a cell that provides highersignal quality than the currently selected cell is generally selected.The process is referred to as the cell reselection. The cell reselectionprocess generally has a basic object to select the cell having thehighest quality to the UE.

In addition to the quality of the radio signal, the network decides apriority for each frequency to notify the priority to the UE. The UEthat receives the priority preferentially considers the priority to aradio signal quality criterion during the cell reselection process.

There may be a method for selecting or reselecting the cell according tothe signal feature of the wireless environment and there may be a cellreselection method described below according to the features of the RATand the frequency of the cell.

-   -   Intra-frequency cell reselection: The UE reselects a cell having        the same RAT and the same center-frequency as a cell which is        being camping.    -   Inter-frequency cell reselection: The UE reselects a cell having        the same RAT and a different center-frequency as the cell which        is being camping.    -   Inter-RAT cell reselection: The UE reselect a cell using an RAT        different from an RAT which is being camping.

A principle of the cell reselection process will be described below.

First, the UE measures the qualities of the serving cell and theneighboring cell for the cell reselection.

Second, the reselection is performed based on the cell reselectioncriterion. The cell reselection criterion has features described belowin association with the measurement of the serving cell and theneighboring cell.

The intra-frequency cell reselection is basically based on ranking. Theranking defines an index value for evaluating the cell reselection andthe cells are ordered in the order of the index value by using the indexvalue. A cell having the best index is generally called a best rankedcell. The cell index value is based on a value which the UE measures forthe corresponding cell and is applied with a frequency offset or a celloffset as necessary.

The inter-frequency cell reselection is based on a frequency priorityprovided by the network. The UE attempts to camp on a frequency havingthe highest frequency priority. The network may provide the frequencypriority to which UEs in cell will commonly apply through broadcastsignaling or provide a frequency-dedicated priority for each UE throughUE-dedicated signaling. The cell reselection priority provided throughthe broadcast signaling may be called the common priority, and the cellreselection priority setup by the network for each UE may be called thededicated priority. When the UE receives the dedicated priority, the UEmay receive the relevant validity time together with the dedicatedpriority. When the UE receives the dedicated priority, the UE starts thevalidity timer which is setup as the relevant validity time. The UEapplies the dedicated priority in the RRC idle mode while the validitytimer is operating. If the validity timer is terminated, the UE discardsthe dedicated priority and applies the common priority again.

The network may provide a parameter (e.g., a frequency-specific offset)used for the cell reselection to the UE for the inter-frequency cellreselection for each frequency.

The network may provide a neighboring cell list (NCL) used for the cellreselection to the UE for the intra-frequency cell reselection or theinter-frequency cell reselection. The NCL includes a cell-specificparameter (e.g., cell-specific offset) used in the cell reselection.

The network may provide a cell reselection black list used for the cellreselection to the UE for the intra-frequency cell reselection or theinter-frequency cell reselection. The UE does not perform the cellreselection for a cell included in the black list.

Subsequently, the ranking performed during the cell reselectionevaluating process will be described.

A ranking criterion used for giving the priority of the cell is definedas illustrated in Equation 1.R _(S) =Q _(meas,s) +Q _(hyst) , R _(n) =Q _(meas,n) −Q _(offset)

Herein, R_(s) represents a ranking criterion of the serving cell, R_(n)represents a ranking criterion of the neighboring cell, Q_(meas,s)represents a quality value which the UE measures for the serving cell,Q_(meas,n) represents a quality value which the UE measures for aneighboring cell, Q_(hyst) represents a hysteresis value for theranking, and Q_(offset) represents an offset between two cells.

In an intra-frequency, when the UE receives an offset Q_(offsets,n)between the serving cell and the neighboring cell,Q_(offset)=Q_(offsets,n) and when the UE does not receive Q_(offsets,n),Q_(offset)=0.

In an inter-frequency, when the UE receives the offset Q_(offsets,n) forthe corresponding cell, Q_(offset)=Q_(offsets,n)+Q_(frequency) and whenthe UE does not receive Q_(offsets,n), Q_(offset)=Q_(frequency).

When the ranking varies while the ranking criterion Rs of the servingcell and the ranking criterion of the neighboring cell R_(n) are similarto each other, the ranking is frequently reversed, and as a result, theUE may alternatively reselect both cells. Q_(hyst) represents aparameter for preventing the UE from alternatively reselecting bothcells by giving hysteresis in cell reselection.

The UE measures the R_(s) of the serving cell and the R_(n) of theneighboring cell according to the above equation and regards a cellhaving the largest ranking criterion value as the best ranked cell andreselects this cell.

According to the criterion, it can be seen that the quality of the cellacts as the most important criterion in the cell reselection. If thereselected cell is not the suitable cell, the UE excludes thecorresponding frequency or the corresponding cell from a cellreselection target.

Hereinafter, a radio link monitoring (RLM) will be described.

A UE monitors DL quality based on the cell-specific reference signal inorder to detect the DL wireless link quality of the PCell. The UEestimates DL wireless link quality for monitoring the DL wireless linkquality of the PCell and compares it with the threshold values Qout andQin. The threshold value Qout is defined with the level in which the DLwireless link cannot be stably received, and it corresponds to 10% blockerror rate of hypothetical PDCCH transmission considering the PDFICHerror rate. The threshold value Qin is defined with the level in whichthe DL wireless link can be stably received, better than the level ofthe Qout, and it corresponds to 2% block error rate of hypotheticalPDCCH transmission considering the PCFICH error rate.

Hereinafter, a radio link failure (RLF) will be described.

The UE performs continuously performs measurement for the quality of aradio link with the serving cell that receives the service. The UEdecides whether communication is impossible under a current situationdue to deterioration in quality of the radio link with the serving cell.When the communication is almost impossible due to too low quality ofthe serving cell, the UE decides the current situation as a wirelessconnection failure.

When a radio link failure is decided, the UE abandons maintainingcommunication with a current serving cell, selects a new cell throughthe cell selection (alternatively, cell reselection) procedure, andattempts RRC connection re-establishment to a new cell.

In the specification of 3GPP LTE, the cases which are not able to do thenormal communication are exemplified as follows.

-   -   The case that the UE determines that there is a serious problem        in the downlink communication link quality based on the radio        quality measurement result of the physical layer of the UE (The        case of determining that the quality of the PCell is low during        performing the RLM).    -   The case that the UE determines that there is a problem in the        uplink transmission since the random access process continuously        fails on the MAC sub layer.    -   The case that the UE determines that there is a problem in the        uplink transmission since the uplink data transmission        continuously fails on the RLC sub layer.    -   The case that the UE determines that the handover fails.    -   The case that the message received by the UE does not pass the        integrity check.

Hereinafter, the process of the RRC connection re-establishment will bedescribed in more detail.

FIG. 7 is a drawing illustrating the procedure of the RRC connectionre-establishment.

Referring to FIG. 7, the UE interrupts the use of all radio bearerswhich was configured except for the Signaling Radio Bearer #0, andinitializes all sorts of sub layers of access stratum (AS). In addition,each sub layer and physical layer is configured as defaultconfiguration. During this process, the UE maintains the RRC connectionstate.

The UE performs the cell selection process for performing the RRCconnection re-establishment process (step, S720). Although the UEmaintains the RRC connection state, the cell selection process may beperformed identically to the cell selection process that the UE performsin the RRC idle state.

The UE determines whether the corresponding cell is proper by verifyingthe system information of the corresponding cell after performing thecell selection process (step, S730). If it is determined that theselected cell is a proper E-UTRAN cell, the UE transmits the RRCconnection re-establishment message to the corresponding cell (step,S740).

Meanwhile, if the cell selected through the cell selection process forperforming the RRC connection re-establishment process is determined tobe the cell that uses different RAT except the E-UTRAN, the RRCconnection re-establishment process is interrupted, and the UE entersthe RRC idle state (step, S750).

The UE may be implemented to complete the verification of thesuitability of the cell within a limited time through the cell selectionprocess and receiving the system information of the selected cell. Forthis, the UE may drive a timer in accordance with the start of the RRCconnection re-establishment process. The timer may be interrupted if itis determined that the UE selects a proper cell. When the timer isterminated, the UE may enter the RRC idle state by regarding the RRCconnection re-establishment as failed. The timer will be referred to asthe radio link failure timer below. In the LTE specification TS 36.331,the timer whose name is T311 may be utilized as the radio link failuretimer. The UE may acquire the setting value of the timer from the systeminformation of the serving cell.

When receiving the RRC connection re-establishment request message fromthe UE and accepting the request, the cell transmits the RRC connectionre-establishment message to the UE.

The UE that receives the RRC connection re-establishment message fromthe cell reconfigures the PDCP sub layer for SRB1 and the RLC sub layer.In addition, the UE recalculates all sorts of key values related to thesecurity setting and reconfigures the PDCP sub layer that is in chargeof the security as newly calculated security key values. Through this,SRB1 is open between the UE and the cell and the RRC control message maybe exchanged. The UE completes the start of SRB1, and transmits the RRCconnection re-establishment complete message which is that the RRCconnection re-establishment process is completed to the cell.

Meanwhile, if the cell receives the RRC connection re-establishmentrequest message and does not accept the request, the cell transmits aRRC connection reestablishment reject message to the UE.

When the RRC connection re-establishment process is successfullyperformed, the cell and the UE perform the RRC connectionreconfiguration process. Through this, the UE recovers the state priorto performing the RRC connection re-establishment process, andguarantees the continuity of the service as much as possible.

Subsequently, the tracking collection entity (TCE) will be described.

The subscriber and equipment trace provide very detailed information onthe call level with respect to one or more of specific mobiles. The datamay be an additional source as the information for the performancemeasurement, and more intensified monitoring and optimized operationshould be permitted. Unlike the performance measurement that alwaysbecomes the source of the information, the trace may be activated inresponse to the request/necessity of a user during a limited timeinterval for a specific object for analysis. The trace takes veryimportant role in the operations such as determining the substantialcause of the mobile malfunction, the improved repairing, the resourceuse and optimization of quality, the radio frequency coverage control,the capacity improvement, the analysis for disconnection during a call,the core network and verifying UTMS process between both ends of theUTRAN.

The function of logging the data on the interface in the call level fora specific user (e.g. international mobile subscriber identity (IMSI)),mobile types (e.g. international mobile equipment identity (IMEI)), IMEIand Software Version (IMEISV) or the service initiated by a user is toacquire the information which cannot be deducted by the performancemeasurement such as the QoS identification of final user during call(e.g., requested QoS vs. provided QoS), protocol messages and thecorrelation between RF measurements or the information processinteroperability among specific mobile benders. The trace data iscollected on the TCE.

Hereinafter, a Minimization Drive Test (MDT) will be described.

An MDT enables UE to perform measurement and report the result thereofinstead of a drive test in which conventional service providers measurethe quality of cells using vehicles for cell coverage optimization.Coverage varies depending on the location of a BS, the deployment ofperipheral buildings, and the using environment of a user. Accordingly,a service provider needs to periodically perform a drive test, whichconsumes lots of costs and resources. In order to overcome thedisadvantages, the MDT is proposed that a service provider measurescoverage using UE.

A service provider may write a coverage map which indicates whether ornot the service is possible over the entire area where the serviceprovider offers the service and indicates the distribution of theservice quality by synthesizing the value of the MDT measurementreceived from the UE, and utilize the written coverage map in thenetwork operations and optimization. For example, when a coverageproblem on a specific area is reported from UE, a service provider mayenlarge the coverage of the corresponding area cell by increasing thetransmission power of the BS that provides service to the correspondingarea. The time and cost required for network optimization can beminimized through such a method.

The MDT has been made based on the framework of a tracking function,that is, one of the tools of an operator for Operation, Administration,and Maintenance (OAM). The tracking function provides an operator withthe ability to perform tracking and to log the behaviors of UE and thuscan enable the operator to determine the major cause of a functionfailure on the UE side. Traced data is collected on a network, which iscalled a Trace Collection Entity (TCE). An operator uses the datacollected in the TCE for analysis and evaluation. A tracking functionused for the MDT includes signaling based on a tracking function andmanagement based on tracking function. While signaling based on atracking function is used to activate the MDT task toward a specific UE,the management based on the tracking function is used to activate theMDT task without being limited to a specific UE.

The MDT may be divided into two types: a logged MDT and an immediate MDTdepending on whether the UE reports measured and stored log data innon-real time or in real time. The logged MDT is a method of the UEperforming the MDT measurement first, logging the corresponding data,and then sending the logged data to a network. On the other hand, theimmediate MDT is a method of the UE performing the MDT measurement andimmediately sending the corresponding data to a network. In accordancewith the logged MDT, the UE performs MDT measurement in the RRC idlestate, but in accordance with the immediate MDT, the UE performs the MDTmeasurement in the RRC connected state.

FIG. 8 is a flowchart illustrating a method of performing a logged MDT.

Referring to FIG. 8, the UE receives a logged measurement configuration(step, S810). The logged measurement configuration may be included in anRRC message and transmitted through a downlink control channel. Thelogged measurement configuration may include at least one of a TCE ID,the information about the reference time that is a basis for logging,the logging duration, the logging interval, and the information aboutthe area configuration. The logging interval indicates an interval atwhich the measurement result is stored. The logging duration indicatesthe duration time for which the UE performs the logged MDT. Thereference time indicates a reference time for the duration time forwhich the logged MDT is performed. The area configuration indicates anarea that is requested to be logged by the UE.

Meanwhile, the UE initiates a validity timer when a logged measurementconfiguration is received. The validity timer means the lifetime of thelogged measurement configuration, which may be specified by theinformation about the logging duration. The duration time of thevalidity timer may indicate the validity of measurement results owned byUE as well as the valid lifetime of the logged measurementconfiguration.

A procedure that the UE performs the logged measurement configurationand the corresponding overall procedure is performed as described aboveis called a configuration phase.

When the UE enters the RRC idle state (step, S821), the UE logs themeasurement result while the validity timer is driven (step, S822). Themeasurement result value may include RSRP, RSRQ, Received Signal CodePower (RSCP), Ec/No, and the like. The information that the measurementresult is logged is called a logged measurement and/or a log of themeasurement result. The time interval at which the UE logs themeasurement result one or more times is called a logging phase.

What the UE executes the logged MDT based on the measurementconfiguration may vary depending on the location of the UE.

FIG. 9 is a drawing illustrating an example of the logged MDT accordingto the logging area.

A network may configure the logging area that is the area in which theUE is to log. The logging area may be represented as a cell list or atracking area/location area list. If a logging area is configured in theUE, the UE stops logging when the UE gets out of the logging area.

Referring to FIG. 9, a first area 910 and a third area 930 are areasconfigured as logging areas, and a second area 920 is an area in whichlogging is not permitted. The UE performs logging in the first area 910,but does not perform logging in the second area 920. The UE performslogging again when the UE moves from the second area 920 to the thirdarea 930.

FIG. 10 is a drawing illustrating an example of the logged MDT accordingto the change of the RAT.

The UE performs logging only when the UE camps on the RAT from which thelogged measurement configuration has been received and suspends loggingin other RATs. However, the UE may the log cell information for otherRATs in addition to camp-on RAT.

A first area 1010 and a third area 1030 are E-UTRAN areas, and a secondarea 1020 is a UTRAN area. The logged measurement configuration isreceived from the E-UTRAN. When the UE enters the second area 1020, theUE does not perform the MDT measurement.

Referring back to FIG. 8, the UE enters the RRC connected state (step,S831). If there is a logged measurement to be reported, the UE informsan eNB that the logged measurement to be reported is present (step,S832). The UE may inform the eNB that the logged measurement is presentwhen an RRC connection is established, an RRC connection isreestablished, or an RRC connection is reconfigured. In addition, if theUE performs the handover, the UE may inform a handover target cell ofthe presence of the logged measurement. What the UE informs that thelogged measurement s present to the eNB may be to transmit including alogged measurement-available indicator, that is, the indicationinformation informing that the logged measurement is present, in an RRCmessage transmitted from the UE to the eNB. The RRC message may be anRRC connection configuration complete message, an RRC connectionreestablishment complete message, an RRC reconfiguration completemessage, or a handover complete message.

When the eNB receives a signal informing that the logged measurement ispresent from the UE, the eNB requests the UE to report the loggedmeasurement (step, S833). Requesting the report on the loggedmeasurement may be to transmit including the logged measurement reportrequest parameter regarding the information indicating the request in anRRC message. The RRC message may be the UE information request message.

When the UE receives the request to report the logged measurement fromthe eNB, the UE reports the logged measurement to the eNB (step, S834).Reporting the logged measurement to the eNB may be to transmit includingthe logged measurement report including pieces of logged measurement inan RRC message to the eNB. The RRC message may be the UE informationreport message. In reporting the logged measurement, the UE may reportall or some of logged measurement owned by the UE at the time ofreporting to the eNB. If the UE reports some of logged measurements, thepart of logged measurement reported may be discarded.

A phase of a process in which the UE informs the eNB that the loggedmeasurement is present, receives a request to report from the eNB, andreports the logged measurement according to the request as describedabove is called a report phase.

What the UE measures while the logged MDT is performed is mainly aboutthe wireless environment. The MDT measurement may include a cellidentity and the signal quality and/or signal intensity of the cell. TheMDT measurement may include the measurement time and place. Thefollowing table exemplifies the contents logged by UE.

TABLE 1 Parameter (set) Description Serving cell identifier Global cellIdentity of Serving cell Measurement results of Reference SignalReceived Power (RSRP) serving cell measured RSRQ of serving cellReference Signal Received Quality (RSRQ) measured RSRQ of serving cellMeasurement results of Cell Identities of measured E-UTRA cells,neighbor cell Measured result of E-UTRA cells Cell Identities ofmeasured UTRA cells, Measured result of UTRA cells Cell Identities ofmeasured GERAN cells, Measured result of GERAN cells Cell Identities ofmeasured CDMA 2000 cells, Measured result of CDMA 2000 cells Time stampThe moment of logging measurement results, calculated as {current timeminus absoluteTimeStamp} in seconds Location information Detailedlocation information at the moment of logging

The information logged at different logging times can be saved to beclassified as different log entries.

FIG. 11 is a diagram showing an example of the logged measurement.

The logged measurement includes one or more log entries.

The log entry includes a logging location, a logging time, a servingcell identity, a serving cell measurement result, and a neighboring cellmeasurement result.

The logging location indicates the location where the UE performsmeasurement. The logging time indicates the time when the UE performsmeasurement. The information logged at different logging times is storedin different log entries.

The serving cell identity may include a cell identity in the layer 3,which is called a Global Cell Identity (GCI). The GCI is a set of aPhysical Cell Identity (PCI) and a PLMN identity.

Meanwhile, the UE may perform logging by analyzing the criteria relatedto the performance of the UE in addition to the wireless environment.For example, the criteria related to the performance of UE may include athroughput, an erroneous transmission/reception rate, etc.

Referring back to FIG. 8, the aforementioned logging phase and reportphase may be present in plural times for the logging duration (steps,S841 and S842).

The eNB may record/store the logged measurement on/in a TCE when thelogged measurement is reported.

If the UE has the logged measurement that has not been reported afterthe validity timer expires, that is, after the logging duration elapses,the UE performs a procedure for reporting the logged measurement to theeNB. A phase in which the overall procedure is performed for this iscalled a post-reporting phase.

When the logging duration expires, the UE discards the loggedmeasurement configuration and initiates a conservation timer. After thelogging duration is terminated, the UE stops the MDT measurement.However, the measurement logged already remains intact without beingdiscarded. The conservation timer indicates the lifetime of theremaining logged measurement.

When the UE enters the RRC connected state (step, S851) before theconservation timer expires, the UE may report the logged measurementwhich hasn't been reported to the eNB. In this case, the procedure forthe logged measurement report aforementioned may be performed (steps,S852, S853 and S854). When the conservation timer expires, the remaininglogged measurement may be discarded. When the logged measurement isreported, the eNB may record/store the logged measurement on/in the TCE.

The conservation timer may be fixed to a predetermined value in the UEand may be previously set in the UE. For example, the value of theconservation timer may be 48 hours. Or, the value of the conservationtimer may be included in the logged measurement configuration andtransferred to the UE or may be included in a different RRC message andtransferred to the UE.

Meanwhile, when a new logged measurement configuration is transferred tothe UE, the UE may update the existing logged measurement configurationinto the newly obtained logged measurement configuration. In this case,the validity timer can be started again from the time when the loggedmeasurement configuration is newly received. In addition, the loggedmeasurement based on the previous logged measurement configuration maybe discarded.

FIG. 12 is a diagram showing an example of an immediate MDT. Theimmediate MDT is based on a radio resource management (RRM) measurementand the report mechanism. In addition, the information related to thelocation upon the measurement report is added and reported to the eNB.

Referring to FIG. 12, the UE receives an RRC connection reconfigurationmessage (step, S1210) and transmits an RRC connection reconfigurationcomplete message (step, S1220). Through this, the UE enters the RRCconnected state. The UE may receive the measurement configuration byreceiving the RRC connection reconfiguration message. In the example ofFIG. 12, the measurement configuration has been illustrated as beingreceived through the RRC connection reconfiguration message, but themeasurement configuration may be included in a different RRC message andtransmitted.

The UE performs measurement and evaluation in the RRC connected state(step, S1231) and reports the measurement result to the eNB (step,S1232). In the immediate MDT, the measurement result may provide theprecise location information, as possible, as in the example of thelocation information provided by the Global Navigation Satellite System(GNSS). For the location measurement, such as an RF fingerprint, themeasurement result may provide the measurement information about aneighboring cell, which may be used to determine the location of the UE.

From FIG. 12, it may be seen that even after the executed measurementand evaluation (step, S1231) and the report (step, S1232), the UEreports the measurement result (step, S1243) to the eNB right afterperforming measurement and evaluation (step, S1242). This is the biggestdifference between the logged MDT and the immediate MDT.

Next, the description related to RLF reporting will be followed.

In order to support the mobility robustness optimization (MRO) ofnetwork, when the RLF occurs or the handover failure occurs, the UEreports such failure event to the network.

After the RRC connection re-established, the UE may provide the RLFreport to the eNB. The radio measurement included in the RLF report maybe used for identifying the coverage problems as a potential reason offailure. The information may exclude such events in the MRO evaluationfor the intra-LTE mobility connection failure, and may use the eventsfor the input of other algorithms.

When the RRC connection re-establishment is failed or the UE is unableto perform the RRC connection re-establishment, the UE reconnects in theidle mode, and then may generate the effective RLF report for the eNB.For this purpose, the UE may save the latest RLF or the informationrelated to the handover failure, and may indicate the LTE cell that theRLF report is valid at every RRC connection (re)establishment and thehandover until the RLF report is loaded by the network or for 48 hoursafter the RLF or handover failure is detected.

The UE maintains the information for the state shift and change of theRAT, and indicates again that the RLF report is valid after going backto the LTE RAT.

The validity of the RLF report in the RRC connection configurationprocedure is that the UE undergoes the disturbance such as a connectionfailure and indicates that the RLF report hasn't been yet transferred tothe network due to the failure. The RLF report from the UE includes thefollowing information.

-   -   The last cell that has provided service to the UE (in case of        the RLF) or the E-CGI of the target of handover. If the E-CGI is        not known, the PCI and the frequency information are used        instead of it.    -   The E-CGI of the cell that tried the re-establishment.    -   The E-CGI of the cell that provides service to the UE when the        last handover is initialized, for example, when the message 7        (the RRC connection reconfiguration) is received by the UE.    -   The time lapsed from the last handover initialization to the        connection failure.    -   The information indicating whether the connection failure is due        to the RLF or the handover failure.    -   The radio measurements.    -   The location of failure.

The eNB that receives the RLF failure from the UE may forward the reportto the eNB that has provided service to the UE before the connectionfailure reported. The radio measurements included in the RLF report maybe used for identifying the coverage issues which are the potentialcauses of the radio link failure. The information may exclude the eventsfrom the MRO evaluation of the intra-LTE mobility connection failure andmay be used to resend them as the input for other algorithm. The RLFreport may be considered as a part of the MDT.

The accessibility measurement will be described as follows.

There are many aspects to deal with the non-availability measurement ofthe connection for the UE, which deal with all of common channels andconnection procedures. In order to inform the ineffectiveness of theconnection to the network and to help the parameter optimization forincreasing the connection validity according to this, the UE performsthe accessibility measurement when the connection establishment isfailed. In order to measure the accessibility, the UE perform thelogging as follows.

-   -   An induced time stamp is included by using the relative timer        that counts the time between the failure and the report. The        saving time for the accessibility measurement is 48 hours.    -   It is supported to report the number of the transmitted random        access preambles.    -   It is included to indicate whether it gets to the maximum power        level.    -   It is included to indicate whether the contention is detected        during the random access procedure for the connection        establishment.

The accessibility measurement may be considered as a part of the MDT.

Subsequently, the positioning will be described.

The function of positioning provides the tool for determining thegeographical location and/or the velocity of the UE based on themeasurement of the radio signal. The location information may berequested by the client that is combined with the UE (e.g., anapplication) or the client that is in or in connection with the corenetwork, and may be reported to the client. The location information isreported with a standard format, which may be implemented based on thecell or geographical coordinate together with the estimated error(uncertainty) of the location and velocity of the UE, and, if possible,with the locating method (or the list of the methods) which is used foracquiring location estimation of the location.

The most of the activated or non-activated UEs in the network may beable to use the location service (LCS) characteristics withoutcompromising of the wireless transmission of the E-UTRAN or signalingcapabilities.

The uncertainty of the location information depends on the method used,the location of the UE within the coverage region and the movement ofthe UE. The various design options of the E-UTRAN system (e.g., the sizeof cell, tunable antenna techniques, path loss estimation value,accuracy of timing and eNB surveys) make the network operator beprovided with the proper and cost-effective UE positioning method formarket.

There are various examples usable for the positioning information. Thepositioning functions may be internally used by the EPS, the value-addednetwork services, the UE itself, or through the network, and by thethird party service. Although the function may be essential or used byadditional emergency service, the location service may not beexclusively allocated for the location service.

The positioning method which is supported in the E-UTRAN may include anetwork-assisted GNSS method, a downlink positioning method, an enhancedcell ID (E-CID) method and an uplink positioning method, and the hybridpositioning method to which one or more methods described above aresimultaneously applied can be used.

The network-assisted GNSS method is based on the UE which is providedwith the radio receiver that is able to receive GNSS signal. The GNSSincludes a global positioning system (GPS), a Galileo, a globalnavigation satellite system (GLONASS), a space based augmentationsystems (SBAS) and a quasi zenith satellite system (QZSS). According tothe network-assisted GNSS method, each of different GNSSs may beindividually used for determining the location of the UE, or at leastone system may be used in combination.

The downlink positioning method, which is also called an observed timedifference of arrival (OTDOA), is based on the timing measured for thedownlink signals which is received by the UE from the multiple eNBs. TheUE measures the timing of the received signal using the assistance datawhich is received from the positioning server. The measurement result isused for determining the location of the UE based on the neighboringeNBs.

In the cell ID (CID) positioning method, the location of the UE isestimated based on the serving eNB of the UE and the acknowledgement ofthe serving cell. The information of the serving eNB and serving cellmay be acquired by paging, tracking area update or other methods. TheE-CID positioning method means the technique that uses the measurementwhich is different from those of an additional UE and/or the E-UTRANradio resource for improving the UE location estimation.

Although the E-CID positioning method utilizes a partially the samemeasurement as the measurement control system on the RRC protocol, theUE is not generally expected to perform an addition measurement only forpositioning. For example, a separate measurement configuration or ameasurement control message is not provided for positioning, and the UEreports the effective measurement owned rather than being required toperform an additional measurement action.

The uplink positioning method, which is also called an uplink timedifference of arrival (UTDOA), is based on the measurement timing at theside of multiple location measurement unit (LMU) for the uplink signalwhich is transmitted from the UE. The LMU measures the signal receivingtiming using the assistance data which is received from the positioningserver.

FIG. 13 is a drawing illustrating an example of the wirelesscommunication system structure to which the positioning of the UEaccording to an embodiment of the present invention is applied.

The MME may receive the request for the location service related to aspecific target UE from a specific entity (e.g., the global mobilelocation center (GMLC) or UE). In addition, as an object such as the IPmultimedia subsystem (IMS) emergency call from the UE, the MME maydetermine to start the location service for a specific target UE byitself. According to this, the MME transfers the location servicerequest to the evolved-service mobile location center (E-SMLC).

The E-SMLC processes the location service request. The E-SMLC mayforward the assistance data to the target UE in order to assist in theUE based and/or UE supported positioning. The E-SMLC may also performthe positioning of the object UE. In processing the location serviceaccording to the uplink method, the E-SMLC may forward the configurationdata to the location measurement units (LMUs). According to this, theE-SMLC may return the result of the location service to the MME.Meanwhile, in case that the location service is requested by otherentity (the UE or E-SMLC), not by the MME, the MME may return the resultto the corresponding entity.

The SUPL location platform (SLP) is a secure user plane location (SUPL)entity that is in charge of user plane positioning.

In order to support the positioning of the target UE and thetransmission of the position support data to the UE, the positionrelated functions are provided, and the functions may be implemented bybeing properly distributed in the structure shown in FIG. 13. Meanwhile,the location service related operations that may be performed among theentities may refer to FIG. 14.

FIG. 14 is a drawing illustrating all procedures for the locationservice according to an embodiment of the present invention.

In case that the MME receives the location service request when the UEis in the ECM-IDLE state, the MME performs the network inducing servicerequest for establishing signaling connection with the UE and allocatinga specific eNB. The UE is assumed to enter the connection state beforeall of the procedures shown in FIG. 14 is started.

The location service is started by the location service request of aspecific entity (step, S1410). The location service request may bestarted as described below.

The UE may request the location service (e.g., positioning or forwardingthe support data) to the serving MME on the NAS level (step, S1410 a). Aspecific entity such as the GMLC in the evolved packet core (EPC) mayrequest the location service (e.g., positioning) for the target UE tothe serving MME (step, S1410 b). The serving MME for the object UE maydetermine whether the location service is necessary, if necessary,request the location service by itself (step, S1410 c). This may be forpositioning the UE on a specific location or emergency call.

The MME forwards the location service request to the E-SMLC (step,S1420).

The E-SMLC performs the location service procedure in response to thelocation service request (step, S1430). The E-SMLC may perform thelocation service procedure with the serving eNB of the UE (step, S1430a). This may include the positioning measurement or acquiring thesupport data. The E-SMLC may perform the location service procedure withthe UE for downlink positioning with step, S1430 a or instead of step,S1430 a (step, 1430 b). This may include acquiring the locationestimation or the positioning measurement or forwarding the locationsupport data to the UE. For the uplink positioning (e.g., the UTDOA),with step, S1430 a, the E-SMLC may perform the location serviceprocedure with one or more LMUs for the object UE (step, S1430 c). Thismay include acquiring the positioning measurement.

The E-SMLC provides the location service response to the MME (step,S1440). In the location service response, the necessary results may beincluded. For example, indicator indicating success or failure and/orthe location estimation for the UE may be included.

The location service response is provided to the entity that requeststhe location service (step, S1450). When the location service request isstarted from the UE as step, S1410 a, the MME may forward the locationservice response to the UE (step, S1450 a). In this case, the locationservice response may be requested with the location estimation of the UEor may include a necessary result. When the location service request isstarted by a specific entity in the EPC as step, S1410 b, the MME mayforward the location service response to the corresponding entity (step,S1450 b). In this case, the location service response may be requestedwith the location estimation of the UE or may include a necessaryresult. When the MME starts the location service request by itself asstep, S1410 c, the location service response which is received from theE-SMLC may be used for the location service (step, S1450 c).

Hereinafter, the positioning operation in a wireless communicationsystem will be described.

Unlike the location service support for specific UEs, the E-SMLC mayinteract with elements in the E-UTRAN for acquiring the measurementinformation that supports one or more positioning methods for all UEs.

The support of downlink positioning method: The E-SMLC may acquire thelocation related information for supporting the downlink positioningmethod, and for this, may interact with the eNB that is accessible fromthe MME that is signally accessed with the E-SMLC. The information mayinclude the timing information for the eNB which is related to theabsolute GNSS time or the timing for other eNBs. In addition, theinformation may include the information for the cell which is supported,and as an example, the positioning reference signal (PRS) schedule maybe included. The signaling access between the E-SMLC and the eNB may beperformed through the MME that maintains the signaling access with theE-SMLC and the eNB.

The support of uplink positioning method: The E-SMLC may interact withthe serving eNB of the UE for retrieving the target UE configurationinformation for supporting the uplink positioning method. Theconfiguration information may include the information requested from theLMU for acquiring the uplink time measurement. The E-SMLC may indicatethat it is needed to transmit the SRS signal to the UE for the uplinkpositioning to the serving eNB. If the requested resource is notavailable, the eNB may allocate a different resource and report theresource allocation to the E-SMLC. The E-SMLC may also let the LMUperform the uplink time measurement and request to report the result.

Hereinafter, the operation of entities related to the UE positioning ina wireless communication system will be described in detail.

The UE may transmit a required signal for the location measurement ofthe UE based on the uplink. In addition, the UE may measure the uplinksignal from different resource like the E-UTRAN and other GNSS system.The measurement method may be determined based on the selectedpositioning method.

The UE may include the location service application or access to thelocation service application through the communication with the networkor other application existed in the UE. The location service applicationmay include the function of measurement and calculation requested fordetermining the location of the UE with the support of the requestednetwork or without the support of the network.

For example, the UE may include an independent positioning function(e.g., GPS), and may report the result independently from the E-UTRANtransmission. The UE equipped with the independent positioning functionmay utilize the support information which is acquired from the network.

The eNB is an element of the E-UTRAN network that supports themeasurement result for the location estimation, and may measure a radiosignal for the target UE and transmit the measurement to the E-SMLC. Ifthe measurement is performed in response for the request or a change onregular or a specific radio state occurs, the eNB may automaticallyperform the measurement and report. The eNB may be configured that theUE transmits the periodical SRS.

The E-SMLC manages the support of the location service for the targetUE, which includes the positioning of the UE and forwarding of thesupporting data to the UE. The E-SMLC may interact with the serving eNBof the UE for acquiring the location measurement for the UE. Themeasurement includes the uplink measurement by the eNB and the downlinkmeasurement by the UE. Among this, the downlink measurement by the UEmay be provided to the eNB through a different function such as thesupport of the handover. The E-SMLC may interact with the eNB forindicating to the serving eNB that it is needed that the UE transmitsthe SRS signal for making it possible to perform the unlink positioningmethod and for acquiring the target UE configuration data which isrequired to calculate the timing of the signal by the LMU. The E-SMLCmay select the set of the LMU which is used for the UTDOA positioning.The E-SMLC may interact with the LMUs which are selected for requestingthe timing measurement. The E-SMLC may interact with the target UE forforwarding the supported data and for acquiring the location estimationif requested.

For the positioning of the target UE, the E-SMLC may determine thepositioning method which is to be used based on the factors includingthe LCS client type, the requested QoS, the positioning capacity valueof the UE, the positioning capacity value of the eNB, and the like.According to this, the E-SMLC may apply the positioning method to the UEand/or the serving eNB. The positioning method includes the locationestimation for the positioning method based on the UE and/or thelocation measurement for the positioning method based on the network.The E-SMLC may combine all received results, and determine the singlelocation estimation for the target UE. The additional information suchas accuracy and velocity of the location estimation may also bedetermined.

The LMU performs the measurement and forwards the measured result to theE-SMLC. All of the location measurement acquired by the LMU may beprovided to the requested E-SMLC. The UE positioning request may involvethe measurement by a plurality of LMUs.

When configuring to report the measurement result on the UE, the networkmay request to perform the positioning (e.g., use of GNSS, etc.) inorder to acquire the location information. According to this, the UE mayactivate the positioning as much as possible in order to acquire thelocation information related to the measurement result, and report theacquired location information with the relevant measurement result.

Meanwhile, since there is a concern that the positioning may cause thepower of UE to be extremely consumed, positioning should be performedvariably as occasion demands. In case that the positioning duration timeis defined and this is informed to the UE, the UE may estimate the powerto be consumed for the positioning. In addition, if the expected valueis within a proper level, the UE may acquire the location information byperforming the positioning for the corresponding duration time. If theduration time is over, the UE may deactivate the positioning to save itspower.

The present invention suggests a method for configuring the durationtime for activating the positioning and acquiring the locationinformation for the positioning duration time and reporting it.

FIG. 15 is a drawing illustrating a reporting method based on variablepositioning according to an embodiment of the present invention.

Referring to FIG. 15, a UE receives the measurement configuration fromnetwork. The measurement configuration may instruct to report thelocation information that has correlation with the measurement result(S1510).

The UE may receive the configuration of positioning duration time thatincludes the information of time duration to perform the positioningfrom the network (S1520). In order for the positioning duration time tobe configured, a separate signaling message is required from the networkto perform it. The signaling message transmitted from the network mayinclude parameters related to a positioning duration time timer. As thepositioning duration time is set, the UE may know the value ofpositioning duration timer that is to be initiated by the positioningactivation. Meanwhile, the positioning duration time may be preset onthe UE, and in this case, the positioning duration time timer may besetup as a predetermined value.

The UE may check whether the condition for positioning activation issatisfied (S1530). The UE may activate only for the case that a specificcondition is satisfied, and accordingly, acquire the locationinformation. The condition for checking the positioning activationcondition may be as follows.

1. The case of logging the measurement result and/or the locationinformation and reporting it, similar to the logged MDT. The UE may beconfigured to acquire the measurement result for specific time duration,and to log the measurement result for the corresponding time duration.In this case, the positioning activation condition may be checked below.

1) The UE may be configured to acquire the measurement result forspecific time duration, and to log the measurement result for thecorresponding time duration. If the UE receives the configuration fromthe network, the UE may determine that the positioning activationcondition is satisfied. In case of the logged MDT, if receiving thelogged measurement configuration that includes the control informationfor performing the logged MDT, the UE may determine that the positioningactivation condition is satisfied.

2) When receiving the configuration and required to perform logging, theUE may determine that the positioning activation condition is satisfied.In case of the logged MDT, if receiving the logged measurementconfiguration from the network and entering the RRC_IDLE state, the UEmay determine that the positioning activation condition is satisfied.

2. The case of logging and reporting immediately based on the networkconfiguration, similar to the immediate MDT. The UE may be configured toreport the measurement result at the time when the report conditionconfigured by the network is satisfied. In this case, the positioningactivation condition may be checked below.

1) If receiving the configuration that requests the positioning (e.g.,the positioning that uses GNSS device) to be activated for acquiring thelocation information, the UE may determine that the positioningactivation condition is satisfied.

2) If receiving the measurement configuration that instructs to reportthe location information together with the measurement result from thenetwork, the UE may determine that the positioning activation conditionis satisfied.

3) In case of receiving the measurement configuration that instructs toreport the location information together with the measurement resultfrom the network, if the report condition instructed by the measurementconfiguration is satisfied, the UE may determine that the positioningactivation condition is satisfied. For example, in case that the UEdetermines that the measurement result performed for a specific timesuch as TimeToTrigger satisfies the report condition and determines toreport the measurement result, the UE may determine that the positioningactivation condition is satisfied.

4) In case of receiving the measurement configuration that instructs toperiodically report the location information together with themeasurement result from the network, the UE may determine that thepositioning activation condition is satisfied before the specific timeon the basis of the periodic report time. For example, in case that theperiodic report timer is configured, the UE may determine that thepositioning activation condition is satisfied before the specific timefrom termination of the periodic report timer.

3. In case of logging and reporting the measurement result immediatelywithout a specific configuration by the network, similar to the RLF, theUE may determine that the positioning activation condition is satisfiedwhen a predetermined report condition being satisfied without theconfiguration of the network. For example, in case that the UEdetermines to report the RLF report message according to the RLFdetection, the UE may determine that the positioning activationcondition is satisfied.

If the UE determines that the positioning activation condition issatisfied, the UE acquires the location information by activating thepositioning and initiates the positioning duration timer (S1540). Whilethe positioning duration timer is operating, the UE may acquire thelocation information by performing the positioning. In order to performthe positioning, the UE may acquire the location information based onthe positioning technique described above. The location information maybe acquired by using the GNSS device. The location information may beacquired by using the LTE Positioning Protocol (LPP). The locationinformation may be acquired by using the E-CID positioning method. Thelocation information may be acquired by using the SUPL method.

The positioning duration timer may be setup as a parameter value relatedto the positioning duration timer which is setup by the network. Theparameter related to the positioning duration timer may be configured toactivate the positioning in order to acquire the location informationthat has the correlation with the measurement result and to indicate thetime length to maintain this. The parameter related to the positioningduration timer may be configured to indicate the start time and the endtime of the positioning activation. In this case, the timer may be setupas the time length from the start time to the end time.

The UE may report the measurement result and the location informationacquired to the network (S1550). The UE may log the measurement resultsand the location information for specific time duration and report it tothe network. Otherwise, if the measurement result is acquired and thereport condition is satisfied, the UE may report the measurement resultand the location information to the network.

Meanwhile, if the report condition is satisfied according to themeasurement result, and in case that an immediate MDT or RLF report assoon as the measurement result is reported, the condition that activatesthe positioning is in relation to the time that satisfies the reportcondition. In this case, since the location information is not acquireddue to the positioning deactivation at the time when the conditions forreporting the measurement result and/or the RLF are satisfied, it maynot report with the location information. According to this, the presentinvention suggests a method that enables to perform a delayed reportaccording to the state of positioning duration timer.

In case that the valid location information related to the measurementresult is still not acquired, if the positioning duration timer isoperating, the UE may generate the report message when the UE acquiresthe location information to report or the positioning duration timer isterminated, and transmit it to the network. On the other hand, if thepositioning duration timer is not operating, the UE may generate thereport message without the location information when the reportingcondition is satisfied, and report it to the network.

In case that the valid location information related to the measurementresult is acquired, the UE may include the corresponding locationinformation in the report message, and transmit it to the network.

The measurement result included in the report message may be the resultfrom the RRM measurement for the serving cell and/or neighboring cell.It may be the measurement result of the UE performance (e.g., delay,throughput, QoS, etc.) on a radio interface. The measurement result maybe the connection failure (e.g., radio link problem/failure, handover,handover failure, connection configuration failure, random accessfailure, etc.) occurred on the UE.

If the positioning duration timer is terminated, the UE may deactivatethe positioning, and stop acquiring of the location information (S1560).

FIG. 16 is a drawing illustrating an example of reporting method basedon variable positioning according to an embodiment of the presentinvention.

The method depicted in FIG. 16, when a UE performs the logged MDT,exemplifies performing it based on the variable positioning.

Referring to FIG. 16, the UE receives the logged measurementconfiguration from the network (S1610). The logged measurementconfiguration may include the information in the logged measurementconfiguration in the logged MDT, which is described with reference toFIG. 8, and further include the positioning duration time configurationinformation for positioning activation/deactivation additionally. Thepositioning duration time configuration information may include theparameter to configure the positioning activation duration timer

The UE enters the RRC_IDLE state (S1620). The UE may determine that thepositioning activation condition is satisfied by entering the RRC_IDLEstate. Accordingly, the UE may activate the positioning, and initiatethe positioning activation duration timer t₀. The positioning activationduration timer may be setup based on the positioning duration timeconfiguration information.

The UE may acquire the measurement result and the location information,and log it (S1630). The UE may acquire the measurement result and log itby performing the measurement with the logging interval which isindicated by the logged measurement configuration. The UE may log withthe latest location information which is acquired by the positioning inthe logging interval section just before the logging time.

If the positioning activation duration timer is terminated, the UE maydeactivate the positioning (S1640). However, acquiring and logging themeasurement result according to the logged MDT may be performed duringthe logging duration time of the logged measurement result, which isindependent to the positioning activation duration timer. Accordingly,if the measurement result is acquired without the location information,the UE may log it (S1650).

In case that the UE enters the RRC_CONNECTED state (S1660) and thereport for the logged measurement configuration is available, the UE maytransit it to the network (S1670). Meanwhile, if the positioningactivation duration timer is not terminated even after the UE enters theRRC_CONNECTED state, it may be configured that the positioningactivation duration timer is terminated when entering the RRC_CONNECTEDstate, and in this case, the UE may deactivate the positioning. Inaddition, lest the positioning activation duration timer operate afterthe end of measurement and logging, the positioning activation durationtimer may be configured to be the same or shorter than the loggingduration time.

FIG. 17 is a drawing illustrating another example of reporting methodbased on variable positioning according to an embodiment of the presentinvention.

The method depicted in FIG. 17, when a UE performs the logged MDT,exemplifies performing it based on the variable positioning.

Referring to FIG. 17, the UE receives the measurement configuration andthe positioning configuration from the network (S1710). The positioningconfiguration may be implemented with the parameter that instructs toreport with the location information in the measurement configurationmessage being included. The positioning configuration may be implementedthrough a separate positioning configuration message from the network.The positioning duration time information may be included in themeasurement configuration message and/or the positioning configurationmessage.

The UE performs the measurement and evaluates whether the reportcondition of the measurement result is satisfied (S1720). Meanwhile, incase of the existing immediate MDT, if the report condition of themeasurement result is satisfied, the measurement report message istransmitted to the network, and the location information is included inthe case that there is valid location information.

On the other hand, in the present embodiment, even in case that thereport condition is satisfied, the measurement report message is nottransmitted, but the UE determines that the positioning activationcondition is satisfied, thereby activates the positioning (S1730). Ifthe UE acquires the location information through the positioning(S1740), the UE may generate the measurement report message thatincludes the measurement result and the location information acquiredand report it to the network (S1750).

If the positioning activation duration timer is terminated, the UE maydeactivate the positioning (S1760).

The UE performs the measurement and evaluates whether the reportcondition of the measurement result is satisfied (S1770). The evaluationof the measurement and report conditions performed by the UE may beindependent from the termination of the positioning activation durationtimer.

If the report condition is satisfied, the UE may generate themeasurement report message that includes the measurement result andreport it to the network (S1780).

FIG. 18 is a drawing illustrating still another example of reportingmethod based on variable positioning according to an embodiment of thepresent invention.

The method depicted in FIG. 18 exemplifies that the report related tothe RLF generation is performed based on the variable positioning.

Referring to FIG. 18, a UE performs measurement and acquires themeasurement result (S1810).

The UE detects the occurrence of the RLF (S1820). The UE may determinethat the positioning activation condition is satisfied when the RLFoccurs, and activate the positioning according to it (S1830). In theexisting case of transmitting the RLF reporting message when the RLFoccurs, the location information is included in the case that there isvalid location information. Meanwhile, in the present embodiment, evenin case that the RLF occurs, the RLF report message may be nottransmitted and the positioning may be activated.

The UE may acquire the location information through the positioning(S1840), generate the RLF report message that includes the measurementresult and the location information, and report it to the network(S1850).

The reporting method based on variable positioning according to theembodiments of the present invention enables a UE to activate thepositioning for a specific interval and to acquire the locationinformation by setting a positioning activation duration time for the UEby network. Consequently, the network is able to acquire the validlocation information more accurately for at least the correspondingactivation interval, and therefore, the network performance can be moreoptimized. In addition, the UE does not always activate the positioningin order to acquire the location information and deactivates it exceptfor the positioning activation duration time, thereby unnecessary powerconsumption can be prevented.

FIG. 19 is a block diagram illustrating the wireless apparatus in whichan embodiment of the present invention can be implemented. The apparatusmay be implemented to perform the reporting method according to theembodiments of the present invention with reference to FIG. 15 to FIG.18.

The wireless apparatus 1900 includes a processor 1910, a memory 1920 anda RF unit 1930. The processor 1910 implements the proposed functions,processes and/or methods. The processor 1910 may be configured todetermine whether to activate the positioning when receiving theconfiguration of the positioning duration time information. Theprocessor 1910 may be configured to activate positioning, initiating thepositioning duration timer, and acquire the location information if thepositioning activation condition is satisfied. The processor 1910 may beconfigured to deactivate the positioning if the positioning durationtimer is terminated. The processor 1910 may be configured to report themeasurement result and/or the location information based on theactivation/deactivation of the positioning. The processor may beconfigured to implement the aforementioned embodiments with reference toFIG. 15 to FIG. 18.

The RF unit 1930 transmits and receives the radio signal with beingconnection to the processor 1910.

The processor may include Application-Specific Integrated Circuits(ASICs), other chipsets, logic circuits, and/or data processors. Thememory may include Read-Only Memory (ROM), Random Access Memory (RAM),flash memory, memory cards, storage media and/or other storage devices.The RF unit may include baseband circuits for processing radio signals.When the embodiment is implemented in software, the aforementionedscheme may be implemented as a module (process or function) thatperforms the aforementioned function. The module may be stored in thememory and executed by the processor. The memory may be placed inside oroutside the processor and may be connected to the processor using avariety of well-known means.

In the above exemplary system, although the methods have been describedbased on the flowcharts in the form of a series of steps or blocks, thepresent invention is not limited to the sequence of the steps, and someof the steps may be performed in a different order from that of othersteps or may be performed simultaneous to other steps. Furthermore,those skilled in the art will understand that the steps shown in theflowchart are not exclusive and the steps may include additional stepsor that one or more steps in the flowchart may be deleted withoutaffecting the scope of the present invention.

What is claimed is:
 1. A reporting method performed by a user equipment(UE) in a wireless communication system, the method comprising:receiving, by the UE, a measurement configuration from a network whichinstructs to transmit at least a measurement result or locationinformation via a report message; receiving, by the UE, a positioningduration time configuration from the network including information oftime duration; evaluating, by the UE, a positioning activationcondition; initiating, by the UE, a positioning duration timer based onthe information of time duration if the positioning activation conditionis satisfied; activating, by the UE, the positioning; acquiring, by theUE, the location information via the activated positioning; andtransmitting, by the UE, the report message to the network based on themeasurement configuration, wherein: the report message includes both thelocation information and the measurement result if the locationinformation related to the measurement result has been acquired, and thereport message includes the measurement result without the locationinformation if the location information related to the measurementresult has not been acquired and the positioning duration timer is notoperating.
 2. The method of claim 1, further comprising: deactivatingthe activated positioning if the initiated positioning duration timer isterminated.
 3. The method of claim 2, further comprising: receiving alogged measurement to perform a logged Minimization Driving Test (MDT).4. The method of claim 3, wherein evaluating the positioning activationcondition includes determining that the positioning activation conditionis satisfied if the user equipment enters RRC_IDLE state.
 5. The methodof claim 1, wherein the measurement result includes at least a resultfor measuring a serving cell or a neighboring cell, a result for UEperformance on a radio interface, or a connection failure generated onthe UE.
 6. The method of claim 2, wherein evaluating the positioningactivation condition includes determining that the positioningactivation condition is satisfied if a report condition for themeasurement result acquired by the measurement is satisfied.
 7. Themethod of claim 2, wherein evaluating the positioning activationcondition includes determining that the positioning activation conditionis satisfied if Radio Link Failure (RLF) is detected.
 8. A wirelessapparatus in a wireless communication system, the wireless apparatuscomprising: a radio frequency (RF) unit that transmits and receives aradio signal; and a processor functionally connected with the RF unitand configured to perform: receiving, from a network, a measurementconfiguration which instructs to transmit at least a measurement resultor location information via a report message; receiving, from thenetwork, a positioning duration time configuration including informationof time duration; evaluating a positioning activation condition;initiating a positioning duration timer based on the information of timeduration if the positioning activation condition is satisfied;activating the positioning; acquiring the location information via theactivated positioning; and transmitting the report message to thenetwork based on the measurement configuration, wherein: the reportmessage includes both the location information and the measurementresult if the location information related to the measurement result hasbeen acquired; and the report message includes the measurement resultwithout the location information if the location information related tothe measurement result has not been acquired and the positioningduration timer is not operating.
 9. The apparatus of claim 8, whereinthe processor is further configured to deactivate the activatedpositioning if the initiated positioning duration timer is terminated.10. The apparatus of claim 9, wherein the processor is furtherconfigured to receive a logged measurement to perform a loggedMinimization Driving Test (MDT).
 11. The apparatus of claim 10, whereinevaluating the positioning activation condition includes determiningthat the positioning activation condition is satisfied if the userequipment enters RRC_IDLE state.
 12. The apparatus of claim 8, whereinthe measurement result includes at least a result for measuring aserving cell or a neighboring cell, a result for UE performance on aradio interface, or a connection failure generated on the UE.
 13. Theapparatus of claim 9, wherein evaluating the positioning activationcondition includes determining that the positioning activation conditionis satisfied if a report condition for the measurement result acquiredby the measurement is satisfied.
 14. The apparatus of claim 9, whereinevaluating the positioning activation condition includes determiningthat the positioning activation condition is satisfied if Radio LinkFailure (RLF) is detected.